2019-09-19 14:43:19 +00:00
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From 5e9082be2fca137fe13b8af15aa0b9d178cd99c1 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 4 Dec 2015 17:41:50 +0000
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] irq-bcm2836: Prevent spurious interrupts, and trap
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2019-07-09 18:32:28 +00:00
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them early
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The old arch-specific IRQ macros included a dsb to ensure the
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write to clear the mailbox interrupt completed before returning
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from the interrupt. The BCM2836 irqchip driver needs the same
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precaution to avoid spurious interrupts.
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Spurious interrupts are still possible for other reasons,
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though, so trap them early.
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---
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drivers/irqchip/irq-bcm2836.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/drivers/irqchip/irq-bcm2836.c
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+++ b/drivers/irqchip/irq-bcm2836.c
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@@ -144,6 +144,7 @@ __exception_irq_entry bcm2836_arm_irqchi
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u32 ipi = ffs(mbox_val) - 1;
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writel(1 << ipi, mailbox0);
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+ dsb(sy);
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handle_IPI(ipi, regs);
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#endif
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} else if (stat) {
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